Ionizing radiation stable polyarylestercarbonate compositions
View Patent ↗Embodiments of ionizing radiation stable polyarylestercarbonate resin compositions, methods for making the ionizing radiation stable compositions, and articles and medical devices made from these ionizing radiation stable compositions are disclosed. For examples the specification discloses a composition which comprises a block copolyarylestercarbonate and a ionizing radiation stablizing additive. The said copolyarylestercarbonate comprises an organic carbonate block and at least one arylate block. The arylate block comprises arylate structural units derived from at least one 1,3-dihydroxybenzene moiety and at least one aromatic dicarboxylic acid moiety. The arylate block has a degree of polymerization of 1 or greater.
1. An irradiated article comprising: a block copolyarylestercarbonate and an ionizing radiation stabilizing additive, wherein said copolyarylestercarbonate comprises an organic carbonate block and at least one arylate block, said arylate block comprising arylate structural units derived from: (a) a 1,3-dihydroxybenzene, and (b) at least one aromatic dicarboxylic acid moiety, wherein the arylate block has a weight averaged molecular weight of between 2000 to about 20,000 and wherein the ionizing radiation stable additive is an aliphatic alcohol or a diaryl sulfide, and wherein the irradiated article has a yellowness shift of less than 40 yellowness index units after 75 kGY of ionizing radiation.
2. The irradiated article of claim 1 , wherein the aromatic dicarboxylic acid moiety is selected from the group consisting of isophthalic acid, terephthalic acid, a halogen-substituted derivative of isophthalic acid, a halogen-substituted derivative of terephtlialic acid, and a mixture thereof.
3. The irradiated article of claim 2 , wherein the ratio of arylate structural units derived from isophthalic acid or acid halide to terephthalic acid or acid halide is from 1:1 to 4:1.
4. The irradiated article of claim 1 , wherein the organic carbonate blocks are derived from bisphenols selected from the group consisting of bisphenol-A, 1,3-dihydroxybenzene, and mixtures thereof.
5. The irradiated article of claim 1 , wherein the at least one aromatic dicarboxylic acid moiety comprises a mixture of isophthalic acid or acid halide and terephthalic acid or acid halide in a molar ratio of about 1:1, and further wherein the organic carbonate block is derived from bisphenol-A.
6. The irradiated article of claim 1 , wherein the arylester content in the copolyarylestercarbonate composition is between 10 wt % to 99wt % based on the weight of the copolyarylestercarbonate.
7. The irradiated article of claim 1 , wherein, the composition further comprises one or more polycarbonate resins.
8. The irradiated article of claim 1 , wherein the ionizing radiation stable additive is selected from a group consisting of polyethylene glycol, polypropylene glycol and hexylene glycol.
9. The irradiated article of claim 8 , wherein the ionizing radiation stable additive is hexylene glycol.
10. The irradiated article of claim 9 , wherein the hexylene glycol is present in the ionizing radiation stable composition in the range of 0.01 to 1 wt % based on the total weight of the ionizing radiation stable composition.
11. The irradiated article according to claim 1 , wherein the composition has the formula I:
wherein m is an integer 1 or greater and n is an integer of 1 or greater wherein R 1 is hydrogen, halogen or C 1-4 alkyl, each R 2 is independently a divalent organic radical.
12. The irradiated article according to claim 11 , wherein R 1 is hydrogen, R 2 is selected from the group consisting of resorcinol and bisphenol-A; and the copolyarylestercarbonate has end groups selected from the group consisting of hydroxyl groups, carboxylic acid groups, phenyl groups, and mixtures thereof.
13. An irradiated medical device comprising a composition that comprises a block copolyestercarbonate and an ionizing radiation stabilizing additive wherein the ionizing radiation stable additive is an aliphatic alcohol or a diaryl sulfide, wherein the copolyestercarbonate comprises an organic carbonate block and at least one arylate block, said arylate block comprising arylate structural units derived from: (a) at least one 1,3-dihydroxybenzene moiety, and (b) at least one aromatic dicarboxylic acid moiety, wherein the arylate block has a weight averaged molecular weight of between 2000 to about 20,000 and wherein the irradiated medical device has a yellowness shift of less than 40 yellowness index units after 75 kGY of ionizing radiation.
14. The medical device of claim 13 , wherein the ionizing radiation stable additive is selected from a group consisting of polyethylene glycol, polypropylene glycol and hexylene glycol.
15. The medical device of claim 14 , wherein the ionizing radiation stable additive is present in the ionizing radiation stable composition in the range of 0.01 to 1 wt % based on the total weight of the ionizing radiation stable composition.
16. An irradiated article comprising a composition that comprises a block copolyarylestercarbonate, wherein the copolyestercarbonate comprises an organic carbonate block and at least one arylate block, said arylate block comprising arylate structural units derived from (a) at least one 1,3-dihydroxybenzene moiety and at least one aromatic dicarboxylic acid moiety wherein the arylate block has a weight averaged molecular weight of between 2000 to about 20,000 and wherein the composition further comprises an ionizing radiation stabilizing additive, wherein the ionizing radiation stable additive comprises is an aliphatic alcohol or a diaryl sulfide and wherein the irradiated article has a yellowness shift of less than 30 yellowness index units after 75 kGY of ionizing radiation.
17. The article according to claim 16 , wherein the article has a yellowness shift of less than 5 yellowness index units when a photobleaching steady state condition is reached after 25 kGy of ionizing radiation.
18. The article of claim 16 , wherein the ionizing radiation stable additive is selected from a group consisting of polyethylene glycol, polypropylene glycol and hexylene glycol.